<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        let number = 18
        let person = {
            name: '张三',
            sex: '男'
        }
        Object.defineProperty(person, 'age', {
            // value: 18,
            // enumerable: true, //是否可以被枚举
            // writable: true, //是否可以被修改
            // configurable: true //是否可以被删除
            get() {
                return number
            },
            set(value) {
                number = value
            }

        })
        console.log(person);
    </script>
</body>

</html>